<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <h2>当前计数：{{counter}}</h2>
    <button v-on:click="add">+</button>
    <button @click="sub">-</button>
</div>

<script src="../js/vue.js"></script>
<script>
     const app = new Vue({
        el: '#app',
        data: {
            message: 'hello xw',
            name: 'hello vue',
            movies: ['西游记','红楼梦','水浒传','三国演义'],
            counter: 0
        },
        methods: {
            add: function () {
                console.log('add被执行');
                this.counter++
            },
            sub: function () {
                console.log('sub被执行');
                this.counter--
            }
        }
    })
</script>

</body>
</html>